SAN FRANCISCO - Democratic presidential hopeful Hillary Clinton may lead among Latinos and women in California, but undecided still rules overall, a poll indicated Tuesday.

The latest Field Poll of 377 likely Democratic primary voters, gave the New York senator a 12-point lead over Sen. Barack Obama, D-Ill., 39 percent to 27 percent, the San Francisco Chronicle reported. Former North Carolina Sen. John Edwards was third with 10 percent.

However, one in five voters polled indicated they were still undecided with the state's primary looming on Feb. 5, so-called Super Tuesday, when 52 percent of all pledged Democratic Party delegates and 41 percent of the total Republican Party delegates are up for grabs.

Clinton's advantage over Obama cut a wide swath among voters polled, including Latinos, seniors and women, the Chronicle said. Obama was favored among African-Americans, college graduates and voters who make at least $80,000 a year, poll results showed.

The two leading Democratic candidates were even in their appeal to men, liberals and non-Hispanic whites.

The margin of error for the poll conducted Jan. 14-20 is 5.2 percentage points.